Lock (electric)

Fail Safe – A lock that is designed to unlock in the event of a loss of power
Fail Secure – A lock that is designed to remain locked in the event of a loss of power
Magnetic (sometimes called Electro-Magnetic) – A lock using a magnetic coil that acts against a steel plate to lock a door
Solenoid – A lock that utilizes a coil and metal plunger to physically lock and/or unlock a door